Vulcanizer



(No Model.) l 2 Sheets-Sheet 1. C. A. DAVIS.

VULGANIZER. No. 420,590. l Patented Peb. 4, 1800.

(N0 Model.) 2 Sheets-Sheet 2.

0. 0.00010. l .i VULCANIZBR. l l No. 420,500. Patented Peb. 4, 1800.

f@ '00cm O. 600m. BV

UNITED STATES PATENTQEFICE.

'CHARLES A. DAvIs, OE ROCHESTER, NEW YORK, AssIeNoR To THE s. s. WHITE DENTAL MANUFACTURINGr COMPANY, OE PHILADELPHIA,

PENNSYLVANIA.

VU LCANIZER.

SPECIFICATION forming part of Letters Patent No. 420,590, dated February 4, 1890.

Application filed March 5, 1889. Serial No. 301,973. (No model.)

To aZZ whom t may concern: I

Be it known that I, CHARLES A. DAvIs, of Rochester, in the county of Monroe and State of New York, have invented certain new and useful Improvements in Vulcanizers, of which the following is a specification.

My invention relates to improvements in apparat-us of the class employed by dentists and others for vulcanizing `dental plates and various articles ofr rubber, such apparatus comprising as essential features an outer casing, sometimes made in a single piece and sometimes in sections, and constituting a su pport for the apparatus, a suitable heater within and at the base of said support, a pot or boiler of less diameter than and sustained within the support, with a closed bottom located above the heater and having an open top to adapt it to receive the flasks containing the rubber to be vulcanized, a lid or cover and packing for closing the boiler-top, means for forcing the cover down upon the boilertop to close it steam-tight, and a gage to indicate the temperature Within the boiler. lIn such apparatus as usually constructed the covers have either been screwed directly to the open' tops of the boilers or otherwise at.- tached to or carried thereby.

My object mainly is to provide a vulcanizer with the cover for the boiler connected with l and carried Aby a support surrounding the boiler, and to so construct and fit the boiler within said support that it may readily be placed therein and removed therefrom and be replaced by another Without injury to or necessitating the loss of other parts of the apparatus. novel organization of parts, as hereinafter claimed.

In the accompanying drawings, which show a vulcanizer embodying my improvements, Figure l is a view partly in elevation and partly in vertical central section. Fig. 2 is a plan or top view showing a slightly modified construction; Fig. 3, a View in elevation thereof; and Figs. 4: and 5 are views in vertical section in the planes of the lines 4 and 5, respectively, of Fig. 2, showing portions of the support and boiler.

To this Vend I have devised a The easing or support A, which is shown as constructed in one piece, is made thicker and stronger than heretofore usual, in order that it may withstand the strain to which it is subjected by the clamping of the cover upon the boiler, as further on explained. A suitable heater is employed, as customary, to heat the open-topped pot or boiler B,which is of a diameter sufficiently less than the intern al diameter of the support for the greater portion of the height of the latter to provide the usual heat-circulating space about the boiler. The boiler is adapted to be sustained within and by the support in such manner that it may rlhe upper portion A of thel support A is i thickened and projects inwardly, thus terminating the heat-circulating space and serving to sustain the boiler, which is provided with va shoulder or flange a, resting on a seat or suppoitingshoulder b of the support.

The cover C and suitable packing c are adapted to be pressed down upon the boilertop to close the boiler steam -tight cover, instead of being Vattached to or connected with the boiler, as heretofore, is independent thereof, being connected with and carried by the outside support A Avin Inanner as now to be described.

An arched or centrally-raised yoke H, with which the cover is connected, serves to connect the cover with the upper end or portion A of the support. swing horizontally to carry the vcover over and upon andV away from the open-topped boiler, and is also adapted to be held irmly connected with the support when the cover is in position for clamping upon and closing the boiler-top. One end of the yoke has a bearing or support f, fitted to turn on a pin d, secured to the support. The other end of the yoke has a hook or open socket f for engaging with a pin c7. at the side of the sup- The yoke is adapted .to-

The

port opposite that to which the pivot--pin for the yoke is located. The thickening of the upper portion of the support adapts it to have the pins d d secured thereto by screwing thcln in place, these pins beingY in the form of screw-bolts with heads g g serving to hold down the yoke. A screw D passes through a threaded central opening of the yoke and serves to connect the cover with the yoke. This screw is provided at its lower end with a ball that fits and turns in a socket ot the cover and allows the latter to adjust itself properly upon the packing and boiler-top. The ball is held to the cover by a divided cap k, as will readily be understood. The screw D is provided at top with a hand-wheel n for turning it, and may have a hole o for the insertion of a lever to turn it when great pressure is required. The cover is provided with the usual gage Z and blow-oit m. With the yoke secured as in Fig. l it is only necessary to turn down the screw with suicient force to close the cover steam-tight upon the boiler, and to inspect or remove the boiler the screw is turned in the direction to lnove it upward and lift the cover from the boiler, the yoke end f is disengaged from the pin d', and the yoke then swung around, as indicated by dotted lines in the drawings, leaving the top of the boiler entirely open and removing all obstruction to its removal.

' From the above description it will be seen that when the cover is clamped in place the boiler is confined between it and the seat provided by the support, the support in reality constituting a part ot the clamping mechan- Y ism; also that by making the cover and clamping mechanism distinct from and unat-tached boiler.

to the boiler the latter can be taken out of the support at will, a longer or shorter boiler substituted for the one before in use, and when a boiler is worn out or defective another may be quickly applied in its place without further loss or inconvenience, which obviously would not be the case were the coverattached directly to or carried by the It will further be seen that as the cover is attached to the horizontally-swin ging yoke it remains connected with the apparatus when swung to. one side, with the gage and 'blow-off maintained in their normal upright positions and not liable to injury.

The flasks E, each made in two parts which are slightly separated, are placed in the boiler in the usual way. For the purpose of holding the flasks firmly in place and for gradually closing them as the rubber sottens,I employ a stiff metallic spring 7', inclosed within a telescoping casing or box G, made up of two parts p p, one sliding within .the other. This box rests on the top of the flasks, 'and when expanded stands above the top of the boiler. When the cover is forced down to close the boiler steam-tight, it acts to compress the spring, thus exerting pressure on the iiasks and maintaining the rubber under constant pressure.

In the construction shown by Figs. 2, 3, 4, and 5 the support is thickened at diametrically-opposite points by projecting outwardly, as well as provided at top with the inward projection, which is, however, of less thickness than before shown. The outward projections are provided by the columns L L. In this way, while the top of the support is madevot a thickness at opposite points sufficient to receive the pins d d', connecting the yoke with the support,it is also extended inwardly suiiiciently to form the shoulder l) for sustaining the boiler and providing the heatcirculating space below this shoulder.

I claim as my invention 1. rlhe combination of the opcntopped boiler provided with the fiange or shoulder, the support provided with the seat upon which the shoulder of the boiler rests, `the cover for closing the boiler-top, the yoke connecting with the support, and the vscrew connecting the yoke and cover and serving to clamp the cover upon the boiler, substantially as and for 4the purpose set forth.

2. The combination of the open-topped boiler provided with the flange or shoulder, the support provided ywith the seat upon which the shoulder of the boiler rests, the cover for closing the boiler-top, the swinging yoke hinged to the support, and the screw connecting the yoke and cover, substantially as and for the purpose set forth.

3. The combination of the open-topped boiler, the support within which the boiler rests, the cover for closing the boiler, `the means for clamping down the cover,`a ilask within the boiler, and the spring confined 'between the cover and flask and borne upon by the cover for exerting constant pressurefupon the flask when the boiler is closed, substantially as set forth.

In witness whereof I have hereunto signed my name in the presence of two subscribing witnesses.

CHARLES A. DAVIS.

Witnesses:

R. F. OscooD, Z. L. DAvis.

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